So I got my Koolance waterblocks yesterday, and put them in last night. I played around with overclocking, and I managed to get from +110 to +130 due to just the cooling alone. I ran a couple benchmarks, played a couple minutes of Skyrim and Batman and SC2 and temps never reached higher than 37C (all when overclocked). I also put in a GTX 570 as a dedicated PhysX card, but for some reason voltage is locked on it.

Actually, I take that back. My overclocks on air was my completely stable overclock. Lower temps don't mean much for overclocking the GTX 680's. However, I find it odd that I can be stable at some games and benchmarks with higher overclocks that aren't stable for others.